Thor is MiA (Missing in Action) And is presumed dead.

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Thor is MiA (Missing in Action) And is presumed dead.
Tony Stark and Hank Pym decide to build a clone of thor with a hair that Tony has, Hence comes forth Ragnarok wich will eventually become part of the Dark Avengers.
Thor will come back after the events of civil war and will eventually die during the events of Fear itself #7 and be replaced by Tanarus for the time being.